The 17-year-old, who was named on Thursday as Tamzin Hall from Wellington, was struck by a car on the motorway between Bridgwater and Taunton after exiting a police vehicle on Monday, November 11.
Tamzin Hall, 17, from Wellington, Somerset, sustained fatal injuries when she was struck by a car between junction 25 at Taunton and 24 at Bridgwater shortly after 23:00 GMT on 11 November.